suppress vs squelch

suppress is not a noun while squelch is a noun.

Word	Noun	Adjective	Verb	Adverb
suppress	No	No	Yes	No
squelch	Yes	No	Yes	No

As verbs, squelch is a hyponym of suppress; that is, squelch is a word with a more specific, narrower meaning than suppress:

suppress (noun)	squelch (noun)
	an electric circuit that cuts off a receiver when the signal becomes weaker than the noise
	a crushing remark

suppress (verb)	squelch (verb)
bring under control by force or authority	suppress or crush completely
lessen to the point of stopping	to compress with violence, out of natural shape or condition
put out of one's consciousness	walk through mud or mire
consciously restrain from showing; of emotions, desires, impulses, or behavior	make a sucking sound
come down on or keep down by unjust use of one's authority